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प्रश्न
Name the quality which is measured in kW.
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उत्तर
Power is measure in kW
संबंधित प्रश्न
If the power of a motor is 100 kW, at what speed can it raise a load of 50,000 N?
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
What do you mean by a centrifugal force?
State the condition when the work done by a force is negative. Explain with the help of examples.
State the condition when the work done by the force is positive
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
Justify the statement. “Power can be expressed as the product of force and velocity.”
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
